Merge "Add windowing_frontend flags to window flags" into main am: 5effed6cda am: 64d057e1d2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2750643

Change-Id: I79319c355287e5af1a9de272ce1a506703d26709
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>